MC68040RC33V Freescale Semiconductor, MC68040RC33V Datasheet - Page 42

• Manufacturer Part Number: MC68040RC33V
• Description: IC MICROPROCESSOR 32BIT PGA-182
• Manufacturer: Freescale Semiconductor

Specifications of MC68040RC33V

• Processor Type: M680x0 32-Bit
• Speed: 33MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 179-PGA
• Family Name: M68000
• Device Core: ColdFire
• Device Core Size: 32b
• Frequency (max): 33MHz
• Instruction Set Architecture: RISC
• Supply Voltage 1 (typ): 5V
• Operating Supply Voltage (max): 5.25V
• Operating Supply Voltage (min): 4.75V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Through Hole
• Pin Count: 182
• Package Type: PGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Compliant

SECTION 2
INTEGER UNIT
This section describes the organization of the M68040 integer unit (IU) and presents a
brief description of the associated registers. Refer to Section 3 Memory Management
Unit (Except MC68EC040 and MC68EC040V) for details concerning the memory
management unit (MMU) programming model, and to Section 9 Floating-Point Unit
(MC68040 Only) for details concerning the floating-point unit (FPU) programming model.
2.1 INTEGER UNIT PIPELINE
The IU carries out logical and arithmetic operations using six separate subunits. Each unit
is dedicated to a different stage of the IU pipeline, handling a total of six separate
instructions simultaneously. Pipelining is a technique that overlaps the processing of
different parts of several instructions. Pipelining simulates an assembly line with the IU
containing a number of instructions in different phases of processing. The IU pipeline
consists of six stages:
The pipeline contains special shadow registers that can begin processing future
instructions for conditional branches while the main pipeline is processing current
instructions. The <ea> calculate stage eliminates pipeline blockage for instructions with
postincrement, postdecrement, or immediate add and load to address register for updates
that occur in the <ea> calculate stage. The write-back stage can write data over the
system bus to store a result in external memory or directly to on-chip caches. These write-
backs to memory can be deferred until the most opportune moment because of the
M68040 bus interface. Figure 2-1 illustrates the IU pipeline.
MOTOROLA
1. Instruction Fetch—Fetching an instruction from memory.
2. Decode—Converting an instruction into micro-instructions.
3. <ea> Calculate—If the instruction calls for data from memory, the location of the
4. <ea> Fetch—Data is fetched from memory.
5. Execute—The data is manipulated during execution.
6. Write-Back—The result of the computation is written back to on-chip caches or
data, its memory address is calculated.
external memory.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
M68040 USER’S MANUAL
2- 1